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There is an electromechanical relay used to control the ups and downs...
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On my 4 post lift all the relay controls is the hydraulic pump, on or off, controlled by a push button.
If the relay were to stick all one would have to do is push the lever that allows the lift to descend. If the pump continues to run, wait until the lift is all the way down and then there is lots of time to go and disconnect the power.